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Finding the Fourth Proportional to 678.30, 936 and 398.52

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Solution

The fourth proportional to 678.30, 936 and 398.52 is: 549.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.30 : 936 = 398.52 : x
  2. Step 2: Convert to fraction form
    678.30/936 = 398.52/x
  3. Step 3: Cross multiply
    678.30x = 936 × 398.52
  4. Step 4: Simplify right side
    678.30x = 373,014.72
  5. Step 5: Solve for x
    x = 373,014.72/678.30
  6. Step 6: Final answer
    x = 549.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.